Device for producing cycloidal curves



(No Model.) 2 SheetsSheet l; W. W. WAINWRIGHT 8v J. H. MORRISON.

DEVICE FOR PRODUGING UYOLOIDAL CURVES.

Patented Jan. 22, 1895.

Wi nesses: Inventors l W I v In, s81 Attorney 2 (No Model.) '2Sheets-Sheet 2.

W. W. WAINWRIGHT -& J. H. MORRISON.

DEVICE FOR PRODUO ING GYGLOIDAL CURVES.

N0. 533,025. Patented Jan. 22, 1895.

' Attorney v UNITED, STAT S PATENT GFFICE.

WILLIAM W. WAINWRIGHT AND JOSHUA MORRISON, OF CONNERSVILLE,

' INDIANA.

DEVVIVCEHFORF puooocmc CYVCLOIDAL cum/Es.

SPECIFICATION forming part of Letters Patent No. 533,025, dated January22, 1895.

Application filed July 11, 1894. Serial No. 517,182. (No modeLl To allwhom it may concern:

Be it known that we, WILLIAM W. WAIN: WRIGHT and JOSHUA H. MORRISON, ofConnorsville, Fayette county, Indiana, have invented certain new anduseful Improvements in Devices for Producing (Jycloidal Curves, of whichthe following is a specification.

Our invention pertains to mechanism for describing cycloidal lines andhas been de; vised with special reference to metal planing machines inwhich it is desirable to give to the point of the cutting tool a feedmovement in a cycloidal path. While we illustrate our new device asadapted for such planer-feeding we suggest its utility under otherconditions where cycloidal lines are to be mechanically described.

We use the term cycloidal in a generic sense as comprehending cycloids,epicycloids, hypocycloids, epitrochoids, 850.

Our invention will be readily understood from the following descriptiontaken in connection with the accompanying drawings, in which- V Figure 1is a front elevation of a mechanism exemplifying our invention asapplied to a metal planing machine; Fig. 2, a side elevation of thesame; Fig. 3, a front elevation of the mechanism adjusted for describinghypocycloids; Fig. 4, a side elevation of. the device adjusted fordescribing hypocycloids, and Fig. 5 a diagonal section of thetool-adjusting segment. n

In the drawings, and confining attention at present entirely to Figs. 1and 2:1, indicates a horizontal straight slide-way, exemplified as thecross-rail of an ordinary metal planing machine; 2, the saddle slidingthereon; 3, the

vertical slide-way on the saddle, at right angles to the slide-way 1,the tool-block 19 moving vertically on the slide-way 3; 4, thecutting-tool; 5, the epicycloidal contour'line of the work to beproducedby the cutting-tool; 6, a toothed segment fixed upon the rail 1, thissegment representing the fundamental circle of the epicycloid to beproduced; 7, a pivot at the center of this segment; 8, an arm swingingon that center; 9, a worm device for swinging arm 8 upon its center;.10,aspindle journaled in arm 8 exterior to the periphery of segment 6; 11,a pinion fast on this spindle and meshing with segment 6, the pitchdiameter of this pinion representing the generating circle; 12, a crankfast on spindle 10, i ts length between the center correspondingwith theradius of the generating circle represented by the pinion 11; 13, arigid connection from tool block 19 to the crank-pin of crank 12; and14, the crank-pin of crank 12.

It will be at onceiobserved that the centerv of crank-pin 14 representsa point in the circumference of the generating circle represented bypinion 11, and that if arm 8 be swung to the right the center of thecrank-- planed with a single tool without adj ustment,

but it is also obvious that if a pointed tool be used and an attempt bemade to plane the entire epicycloidal contour, the tool will not presentitself properly to the work. Provision'is therefore made for adjustingthe tool center.

Referring further to the drawings: 15, indicates a segmental dove-tailguide-way carrie d by the tool-block and forming a part of thetool-h0lder, the center of the segment being the point of thecutting-tool 16, the'toolat various angles, with the tool point as aholder, carrying the cutting-tool and fitted to slide upon the guide-wayl5; 17, a Worm carried by the tool-holder 16 and engaging the,

segmentof tool on the guide-way 15 and providing for the, convenientangular adjustment of the tool, and 18 another one of these segmentaltool holding arrangements but made left handed, calling the other righthanded, this secondtool-holding arrangement being employed for operatingupon the opposite side of the epicycloid, the. dotted lines above andbelowindicatiug the position of the generating pinion and of thetool-holding arrangement, respectively, when working upon the right handportion of the epicycloid.

As shown in Fig. 1 tool 4 is just ready to begin its feeding movementupward and to the right. As the movement progresses the angle of thetool may be adjusted on segment 15 so that there is always maintained afair tool presentation. When a crown of the epicycloid has been passed,or so far passed that the lower extremity of segment 15 would strike thework then the tool-holding arrangement is removed and the left handedone 18 substituted.

In the example shown in Fig. 1 crank 12 has a length. equal to theradius of the generating circle. If epitrochoids are to be de-. scribedthen the length of the crank arm will be modified accordingly. It is ofcourse to be understood that the proportion or geometric character ofall of the controlling parts is to be arranged with reference to thedesired cycloidal curve to be described, the radius of the fundamentalcircle represented by segment 6 being made as desired between possibleminimum and infinity, the segment in the latter case becoming of coursea rack.

Proceeding with the drawings, but giving attention now to Figs. 3 andt:20, indicates a circular disk mounted for rotation in the arm 8, thecenter of this disk coinciding with the pitch line'of segment 6, and thespindle 10 being 'journ'aled in the disk so that by turning the diskspindle 10 may be brought outside the fundamental circle represented bysegment 6, as in the case of Fig. l, or inside that circle, as in Fig.3; 21, a set screw for securing the disk 20 in either one of the twopositionsjust mentioned; 22, the hypocycloid to be produced, and 23, apinion carried by arm 8 and meshing at once with the segment 6 and'withgenerating pinion 11 which, under the new adjustment, no longer mesheswith the segment 6 but has a position against its face. a

In Fig. 2, representing the device when adjusted as in Fig. 1, fordescribing epicycloids, pinion 11 is exterior to and meshes with thesegment 6; but notice in Fig. 4 that pinion 11 has been pulled forwardthus permitting disk 20 to be turned, thus carrying pinion 11 downalongside of segment6 with their peripheries even. Pinion 23, which isan idler, may now engage pinion 11 and the segment 6, the effect uponpinion 11 as arm 8 moves being pre- .cisely the same as if segment 6 hadbeen changed to an internal segment to engage pinion 11. Under theseconditions the generating circle is within the fundamental circle and ahypocycloid is described by the point of the tool.

We claim as our invention- 1. In a device for producing cycloidalcurves, the combination, substantially as set forth, of a fixedfundamental line of teeth, a spindle carrier arranged for movement alongsaid line of teeth, a spindle carried by said spindle carrier, a pinionon said spindle and connected with said fundamental line of teeth, acrank on said spindle, a curve-tracer,

as a cutting-tool, having two guides in right lines at right anglesto'each other, and a connection from said curve-tracer to the crankpinof said crank, and steadied by said rightline guides.

2. In a device for producing cycloidal curves, the combination,substantially as set forth, of a fixed fundamental line of teeth, aspindle-carrier arranged to move along said line of teeth, a spindlemounted in said spindle-carrier in a bearing adjustable to positionsinside and outside of said fundamental line of teeth, a. pinionon saidspindle, a crank on said spindle, a removable idle pinion mounted onsaid spindle-carrier and engaging said first mentioned pinion and saidfundamental line of teeth, a curve tracer, as a cutting-tool, mountedupon a pair of slide-ways at right angles to each other, and aconnection from said curve tracer to said crank.

8. In a device for producing cycloidal curves, the combination,substantially as set forth, of a slideway, a fundamental segment fixedthereto, an arm pivoted at the center of said fundamental segment, aspindle journaled in said arm, a crank carried by said spindle, a pinionon said spindle and connected with said fundamental segment, a saddlefitted upon said slide-wayand'carrying a slide-way at right angles tosaid first mentioned slide-way, a curve tracer, as a cuttingtool,arranged to be guided by said second slide-way, and a connection fromsaid curve tracer to said crank.

4. In a device for producing cycloidal curves, the combination,substantially as set forth, of a slide-way, a saddle thereon, a guidewayon the saddle at right angles to said slide- 1 way, a curve tracer, as acutting-tool, mounted on said guide-way, a fundamental segment fixed tosaid slide-way, an arm pivoted at the center of said segment, a spindlemounted in said arm, a pinion carried by said spindle, a

crank carried by said spindle and connected with said curvetracer, and aremovable idle pinion carried by said arm and engaging said firstmentioned pinion and said segment.

5. In a device for producing cycloidal curves, the combination,substantially as set forth, of a slide-way,a saddle mounted thereon andcarrying a guide-way at right angles to said slide-way, a curve tracer,as a cuttingtool, mounted on said guide-way, a fundamental segment fixedto said slide-way, an arm pivoted at the center of said segment, a disk1 mounted in said arm, a removable idle pinion mounted on said arm andengaging said fundamental segment, a spindle journaled in 1 said disk, apinion on said spindle and engaging said idle pinion, and a crank onsaid spin- 1 dle and connected with said curve tracer.

WILLIAM W. WAINWRIGHT. JOSHUA I-I. MORRISON. I'Vitness'es:

O. D. L. ROOTS, GEO. H. FULLERTON.

IIO

